DK2226951T3 - A system for wireless transmission and reception of inductively coupled data - Google Patents
A system for wireless transmission and reception of inductively coupled data Download PDFInfo
- Publication number
- DK2226951T3 DK2226951T3 DK10165164.4T DK10165164T DK2226951T3 DK 2226951 T3 DK2226951 T3 DK 2226951T3 DK 10165164 T DK10165164 T DK 10165164T DK 2226951 T3 DK2226951 T3 DK 2226951T3
- Authority
- DK
- Denmark
- Prior art keywords
- terminals
- terminal
- induction coil
- antenna circuit
- tuning capacitor
- Prior art date
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- 230000005540 biological transmission Effects 0.000 title claims 12
- 230000001939 inductive effect Effects 0.000 claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims 16
- 230000008901 benefit Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- H04B5/24—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
- H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils
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- H04B5/22—
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- H04B5/26—
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- H04B5/263—
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- H04B5/48—
Abstract
This invention relates to a system (100) for communicating wirelessly. The system (100) comprises an inductive antenna circuit (110) for transmitting and receiving inductively coupled signals, a driving means (102, 104) connected to inductive antenna circuit (110) and driving the inductive antenna circuit (102, 104) during a transmit mode, and comprises an amplifier means (112) connected to the inductive antenna circuit (110) and detecting and amplifying received signals differentially a receiving mode.
Description
DESCRIPTION
Field of invention [0001] This invention relates to a system for wreless communication between for example a remote controller and a hearing aid such as a behind-the-ear (BTE), an in-the-ear (ITE), an in-the-canal (ITC) or a completely-in-canal (CIC), or an implanted hearing aid.
Background of invention [0002] Transmit/receive switching means in hearing aids, such as disclosed in American patent application no.: US 2005/111682, are used for providing switching between transmit and receive modes in hearing aids for wireless communication. This American patent application describes a system wherein an inductive coil operating as an antenna is switched between an equivalent series resonant circuit reducing inductive load in transmit mode and an equivalent parallel resonant circuit increasing inductive load in the receive mode. The system further utilises a transmit/receive-switch to establish a voltage protection during the transmit mode of a low noise amplifier (LNA) used for amplifying received data during the receive mode.
[0003] American patent application no.: US 2005/0110700 discloses a method for transmitting and receiving signals using an antenna element electrically connected to a driver and an amplifier. The antenna element comprises a coil including a core having a high magnetic permeability surrounded by coiled wire. The coiled wire is split into a first portion and a second portion. An additional capacitor is connected in series between the first portion and the second portion of the coil. The amplifier has a selectable input impedance. A lower first input impedance is selected to amplify the received signal from the antenna element, and a higher second input impedance is selected to monitor the transmitted signal from the driver. A switch toggles an effective input impedance for the amplifier between the second impedance and the first impedance.
[0004] Despite the advances achieved within the hearing aid technology by the above described transmit-receive switching means there still is a need for providing improvements of the noise rejection during receive mode, improvements of the voltage protective elements, and provide means for switching between transmit and receive mode without changing the antenna matching.
Summary of the invention [0005] An object of the present invention is to provide a system for providing wireless communication with an improved noise rejection.
[0006] It is a further object of the present invention to provide a hearing aid comprising a system for wireless communication between a hearing aid and a remote controller as well as binaurally between a set of hearing aids.
[0007] A particular advantage of the present invention is the provision of a simple protection of a low noise amplifier amplifying the received communication.
[0008] Another advantage is the provision of transmit/receive switching without loss of performance.
[0009] The above objects and advantages together with numerous other objects, advantages and features, which will become evident from below detailed description, are obtained according to a first aspect of the present invention by a system for communicating wirelessly and comprising an inductive antenna circuit adapted to transmit and receive inductively coupled signals and having a first and second set of terminals, a driving means connected to said first set of terminals and adapted to drive said inductive antenna circuit during a transmit mode, an amplifier means connected to said second set of terminals and adapted to detect and amplify an incoming differential signal during a receiving mode.
[0010] The system according to the first aspect achieves a common mode rejection of signals electrically coupled to the two antenna terminals. Hence the amplifier means coupled as a differential amplifier ensures a significantly improved noise reduction scheme.
[0011] The system according to the first aspect of the present invention further may comprise a current sensing means interconnecting said second set of terminals with a non-inverting input and an inverting input of said amplifier means. The current sensing means may comprise a low input impedance buffer having current to voltage conversion capabilities. The low input impedance buffer may convert a sensed current to a voltage for the inverting and non-inverting input of the amplifier means. Hence the problems inheritably associated with prior art switching between a transmitting and receiving mode are avoided, namely problems relating to the amplifier means being exposed to damaging high voltages induced by the inductive antenna circuit during the transmit mode and disturbance of the resonance frequency of the inductive antenna circuit by stray and blocking capacitances or any other protective elements.
[0012] The low impedance buffer according to the first aspect of the present invention may comprise a common base coupled transistor. Thus the impedance buffer effectively may convert the current generated in the inductive antenna circuit to a voltage to be amplified by the amplifier means.
[0013] The driving means according to the first aspect of the present invention may comprise a first power output presenting a square wave to a first terminal of said first set of terminals and a second power output presenting an inverted square wave to a second terminal of said first set of terminals. Hence the inductive antenna circuit advantageously is presented with a square wave alternating between a positive and negative maximum, which enables a differential voltage signal to be transmitted as well as received and differentially amplified by the amplifier means.
[0014] The inductive antenna circuit according to the first aspect of the present invention may comprise a series connection of tuning capacitors on either side of a transmit/receive inductor between said first and second set of terminals. Hence the first and second set of terminals are connected together and therefore no switching between components is required when changing from transmit to receive mode.
[0015] Additionally, or alternatively, the inductive antenna circuit may comprise a series connection of transmit/receive inductors on either side of a tuning capacitor between said first and second set of terminals. This series connection provides a well defined zero point between the first and second set of terminals, and provides, as the above mentioned series connection, an inductive antenna solution which does not require switching between components when changing from transmit to receive mode.
[0016] The inductive antenna circuit according to the first aspect of the present invention may alternatively comprise a first series connection of tuning capacitors on either side of a transmit inductor between said first set of terminals, or a first series connection of transmit inductors on either side of a tuning capacitor between said first set of terminals. The inductive antenna circuit may further comprise a second series connection of tuning capacitors on either side of a receive inductor between said second set of terminals, or a second series connection of receive inductors on either side of a tuning capacitor between said second set of terminals.
[0017] The inductive antenna circuit according to the first aspect of the present invention may further comprise a magnetic coupling core. The magnetic coupling core advantageously increases the magnetic flux permeability and therefore the transmit inductor and the receive inductor are capable of being reduced in size. This obviously is particularly advantageous for implementation of the system according to the first aspect in a hearing aid.
Brief description of the drawings [0018] The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, with reference to the appended drawing, wherein: figure 1, shows a system for communicating wirelessly according to a first embodiment of the present invention; figure 2, shows an inductive antenna circuit; figure 3, shows an inductive antenna circuit; figure 4, shows an inductive antenna circuit according to a second embodiment of the present invention; and figure 5, shows an inductive antenna circuit according to a third embodiment of the present invention.
Detailed description of preferred embodiments [0019] In the following description of the various embodiments, reference is made to the accompanying figures, which show by way of illustration how the invention may be practiced. It is to be understood that other embodiments may be utilized and structural and functional modifications may be made without departing from the scope of the present invention.
[0020] Figure 1, shows a system for communicating wirelessly, which is designated in entirety by reference numeral 100. The system 100 comprises a set of drivers 102,104 operating 180° out of phase in transmit mode, shown in graphical representations 106, 108, respectively, so as to establish a square wave transmit signal across a transmit/receive antenna 110, which alternates between a positive maximum and negative minimum, shown in graphical representation 109.
[0021] In transmit mode the transmit/receive antenna is driven as a full bridge class D transmitter. That is, enveloping the transmit data in pulse width of the square wave transmit signal. In an alternative embodiment the transmit/receive antenna is driven as a half bridge class D. The square wave transmit signal may be coded in accordance with any protocol known to a person skilled in the art including any proprietary protocols.
[0022] The system 100 further comprises a low noise amplifier 112 receiving the received signal across a first 114 and second 116 input port. The low noise amplifier 112 comprises a differentially coupled operational amplifier 118 amplifying the voltage difference between the first 114 and second 116 input ports and providing an amplified difference signal on output port 120. In this context the term "amplified" should be construed as an amplification range from unity to 1000, such as 10 or 100, which amplification obviously is controlled by the value of resistances R1 and R2. It should be understood that this difference amplifier circuit may be implemented in any configurations known to a person skilled in the art.
[0023] The system 100 further comprises current sensing amplifiers 122, 124 interconnecting the end terminals of the transmit/receive antenna 110 and the input ports 114,116 of the low noise amplifier 120. The current sensing amplifiers 122,124 in the first embodiment of the present invention comprises a low input impedance buffer, such as a common base transistor configuration, for transforming current input signals from the transmit/receive antenna 110 to output voltage signals, which are forwarded to the input ports 114,116.
[0024] The low input impedance implementation of the current sensing amplifiers 122, 124 further ensures that the resonance frequency of the transmit/receive antenna 110 is not significantly disturbed by the complex imaginary part of the input impedance.
[0025] Figure 2, shows an inductive antenna circuit 110 according to first embodiment of the present invention, which comprises a series connection of tuning capacitors 202, 204 on either side of a transmit/receive inductor 206 between end terminals 208, 210. The end terminal 208 is connected to driver 102 and current sensing amplifier 122, and end terminal 210 is connected to driver 104 and current sensing amplifier 124. The inductor may be an air coil or a wounded on a ferrite material core.
[0026] Figure 3, shows an inductive antenna circuit 110, which comprises a series connection of transmit/receive inductors 302, 304 on either side of a tuning capacitor 306 between end terminals 308, 310. The end terminal 308 is connected to driver 102 and current sensing amplifier 122, and end terminal 310 is connected to driver 104 and current sensing amplifier 124. The two inductors may be air coils or both inductors wound on a single or two separate ferrite material cores.
[0027] Figure 4, shows an inductive antenna circuit 110 according to a second embodiment of the present invention, which comprises a first series connection 402 of tuning capacitors 404, 406 on either side of a transmit inductor 408 between end terminals 410,412. The end terminals 410,412 are connected to drivers 102 and 104.
[0028] The inductive antenna circuit 110 according to the second embodiment of the present invention further comprises a second series connection 414 of tuning capacitors 416, 418 on either side of a receive inductor 420 between end terminals 422, 424 The end terminals 422, 424 are connected to current sensing amplifiers 122 and 124.
[0029] The inductive antenna circuit 110 according to the second embodiment of the present invention further comprises a magnetic core 426 for supporting the windings of the transmit inductor 408 and the receive inductor 420.
[0030] Figure 5, shows an inductive antenna circuit 110 according to a third embodiment of the present invention, which comprises a first series connection 502 of transmit inductors 504, 506 on either side of a tuning capacitor 508 between end terminals 510, 512. The end terminals 510, 512 are connected to drivers 102 and 104.
[0031] The inductive antenna circuit 110 according to the third embodiment of the present invention further comprises a second series connection 514 of receive inductors 516, 518 on either side of a tuning capacitor 520 between end terminals 522, 524. The end terminals 522, 524 are connected to current sensing amplifiers 122 and 124.
[0032] The inductive antenna circuit 110 according to the third embodiment of the present invention further comprises a magnetic core 526 for supporting the windings of the transmit inductors 504, 506 and the receive inductors 516, 518.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description • US20Q51116B2A [0002] • US20050110700A [00031
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10165164.4A EP2226951B1 (en) | 2005-08-22 | 2005-08-22 | A system for wirelessly transmitting and receiving inductively coupled data |
EP05107693A EP1758261B1 (en) | 2005-08-22 | 2005-08-22 | A system for wirelessly transmitting and receiving inductively coupled data |
Publications (1)
Publication Number | Publication Date |
---|---|
DK2226951T3 true DK2226951T3 (en) | 2017-03-27 |
Family
ID=35596632
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK05107693.3T DK1758261T3 (en) | 2005-08-22 | 2005-08-22 | System for wirelessly transmitting and receiving inductively coupled data |
DK10165164.4T DK2226951T3 (en) | 2005-08-22 | 2005-08-22 | A system for wireless transmission and reception of inductively coupled data |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK05107693.3T DK1758261T3 (en) | 2005-08-22 | 2005-08-22 | System for wirelessly transmitting and receiving inductively coupled data |
Country Status (6)
Country | Link |
---|---|
US (1) | US7822390B2 (en) |
EP (2) | EP1758261B1 (en) |
CN (1) | CN1921331B (en) |
AT (1) | ATE472860T1 (en) |
DE (1) | DE602005022068D1 (en) |
DK (2) | DK1758261T3 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7512383B2 (en) * | 2003-11-26 | 2009-03-31 | Starkey Laboratories, Inc. | Transmit-receive switching in wireless hearing aids |
ATE520207T1 (en) | 2007-06-27 | 2011-08-15 | Nxp Bv | TRANSMITTER WITH ADJUSTABLE TRANSMISSION LEVEL FOR A MAGNETIC CONNECTION |
EP2747039B1 (en) * | 2012-12-21 | 2020-02-19 | Valeo Sécurité Habitacle | Motor vehicle remote control comprising a magnetic coupling cancellation device |
US10359450B1 (en) * | 2017-01-10 | 2019-07-23 | Keysight Technologies, Inc. | Current sensing probe incorporating a current-to-voltage conversion circuit |
CN109950696B (en) | 2018-04-25 | 2021-01-29 | 京东方科技集团股份有限公司 | Rectifying antenna |
US10637528B2 (en) * | 2018-07-23 | 2020-04-28 | Audiowise Technology Inc. | Inductor circuit and wireless communication devices |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1223346A (en) * | 1984-08-14 | 1987-06-23 | Siltronics Ltd. | Antenna |
JP2001160770A (en) * | 1999-12-02 | 2001-06-12 | Sony Corp | Digital data transmission equipment |
KR100916007B1 (en) * | 2001-11-30 | 2009-09-10 | 소니온 에이/에스 | A high efficiency driver for miniature loudspeakers |
US6940466B2 (en) * | 2003-11-25 | 2005-09-06 | Starkey Laboratories, Inc. | Enhanced magnetic field communication system |
US7512383B2 (en) | 2003-11-26 | 2009-03-31 | Starkey Laboratories, Inc. | Transmit-receive switching in wireless hearing aids |
US7495626B2 (en) * | 2005-07-12 | 2009-02-24 | Hz Antenna, Llc | Antenna for electron spin radiation |
-
2005
- 2005-08-22 DK DK05107693.3T patent/DK1758261T3/en active
- 2005-08-22 EP EP05107693A patent/EP1758261B1/en active Active
- 2005-08-22 EP EP10165164.4A patent/EP2226951B1/en not_active Not-in-force
- 2005-08-22 AT AT05107693T patent/ATE472860T1/en not_active IP Right Cessation
- 2005-08-22 DE DE602005022068T patent/DE602005022068D1/en active Active
- 2005-08-22 DK DK10165164.4T patent/DK2226951T3/en active
-
2006
- 2006-07-13 US US11/485,431 patent/US7822390B2/en active Active
- 2006-07-28 CN CN2006101039610A patent/CN1921331B/en active Active
Also Published As
Publication number | Publication date |
---|---|
ATE472860T1 (en) | 2010-07-15 |
US7822390B2 (en) | 2010-10-26 |
EP2226951A2 (en) | 2010-09-08 |
EP2226951A3 (en) | 2012-05-23 |
EP1758261B1 (en) | 2010-06-30 |
DK1758261T3 (en) | 2010-10-18 |
DE602005022068D1 (en) | 2010-08-12 |
CN1921331A (en) | 2007-02-28 |
EP1758261A1 (en) | 2007-02-28 |
EP2226951B1 (en) | 2017-01-11 |
US20070041601A1 (en) | 2007-02-22 |
CN1921331B (en) | 2012-03-21 |
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